Crosscut table-saw.



No. 776.916. PATENTED NOV. 29, 1904.

' W. A. FIRSTBROOK.

. GROSSGUT TABLE SAW.

APPLIOATIQN FILED AFB. 3, 1903.

N0 MODEL. 2 SHEETS-SHBET 1.

No. 775,916. PATENTED NOV. 29, 1904. W. A. FIRSTBROOK.

GROSSGUT TABLE SAW.

APPLICATION FILED APE.S,19OS.

N0 MODEL. 2 SHEETS-SHEET 2.

360%706 55 25 g. calf NITED STATES Patented November 29, 1904.

W'ILLIAM ASHALL FIRSTBROOK, OF TORONTO, CANADA.

CROSSCUT TABLE-SAW.

SPECIFICATION forming part of Letters Patent No. 775,916, dated November 29, 1904.

Application filed April 3, 1903. Serial No. 150,935. (No model.)

To a whom it may concern.-

Be it known that 1, WILLIAM AsHALL FIRs'r- BROOK, a subject of the King of Great Britain, residing at Toronto, Ontario,Canada,have invented certain new and useful Improvements in Orosscut Table-Saws, of which the following is a full, clear, and exact description.

My invention relates to improvements in crosscut table-saws, and has for its main object the provision of specific means for moving the table which carries the lumber to be sawed sidewise from front to rear or Vice versa of the frame across the face of the rotary saw in contradistinction to moving the table endwise, as in previous machines, toward and from the edge of the rotary saw.

Another object of my invention is to provide a practical form of power-feed having a treadle-operating device located transversely of the machine in a convenient position with relation to the saw and table,so as to be readily controlled by the operator.

Another object of my invention is to so locate the power-shaft having a friction-gear and driven shaft having a friction-pulley driven by the friction-gear with relation to each other that by slightly raising or lowering one end of the power-shaft the frictiongear is quickly brought into and withdrawn from contact with the driven pulley, so that the table can be instantly and regularly stopped at the return from each cut.

1 accomplish these ends by providing the mechanism and combinations which I will now describe by reference to the accompanying drawings, in which like characters of refer" ence indicate corresponding parts.

Figure 1 is a plan view of my invention. Fig. 2 is a side elevation. Fig. 3 is an end elevation looking to the left in Fig. 2. Fig.

4 is a vertical section on the line as m, Fig. 2.

Fig. 5 is a detail of the treadle and pulleys.

1 is the frame or bed,and1 the transverselyarranged standards upon which the frame is supported. 2 is the saw, and 3 is the transversely-reciprocating table across the face of the saw. The saw is mounted in the usual manner and is power-driven. The table is also mounted in the usual manner on the bed on rollers 3, which tread on tracks 1", extending crosswise of the bed. These are the common features and are not claimed as new we cept in combination with the friction-feed and treadle mechanism which I will now describe.

4 is a lower longitudinal shaft journaled to outer and inner standards 1 of the frame 1 and driven continuously by the same power. that drives the saw, as by a pulley 5.

6 is a paper friction-pulley rigidly mounted upon the shaft 4:. The shaftd is loosely mounted in a bearing 1 at its outer end and in a bearing 1 at its inner end. The bearing of the shaft 4 adjacent to the pulley 6 is made sufficiently free to permit of a slight up-anddown movement of the shaft in order that the friction-pulley may be thrown into contact, as hereinafter more fully described.

7 is a treadle of bell-crank-lever shape pivoted in a base-block 8 adjacent to the inner standard and having at its inner and upper end a sleeve 9, which takes freely over the shaft a.

10 is an upper longitudinal shaft journaled to outer and inner standards of the frame 1 and carrying rigidly mounted thereon a pulley 11, which is capable of being acted upon by the pulley 6. The shaft 10 is mounted in bearings 1 and 1, located over the lower bearings 1 and 1, respectively.

12 12 are paired parallel disks rigidly mounted upon the ends of the shaft 10, which project through the standards. These disks carry crank-pins 13 13, which turn in sliding blocks 14 1 1, working in the paired parallel slotted arms 15 15, which slotted arms are pivoted at their lower ends to horizontal lugs 1 on outer and inner standards of the frame 1, and at their upper ends are pivoted to paired parallel connecting-bars 16 16, which at their opposite ends are pivoted to depending lugs 17, secured to the under side of the table 3.

Having. indicated the principal parts, I will now describe the operation. A board or other piece of lumber to be sawed being in place on the table 3 the operator presses down on the 9 treadle 7 The sleeve 9 raises the end of the shaft 4 adjacent to the paper-pulley 6 (as it may do by reason of the free space in the journal-bearing, as above mentioned) until the pulley 6 comes in frictional contact with the pulley 11. This causes the pulley 11 to revolve, and the disks 12 12 and their crankpins cause the arms 15 15 to swing over a dis tance equal to the diameter of the circle described by the crank-pins. The arms 15 15 communicate such reciprocatory movement to the table 3 through the bars 16 16. A complete revolution of the shaft 10 causes the table 3 to complete one reciprocatory movement, and thereupon the operator releases the treadle 7, allowing the pulley 6 to fall out of contact with the pulley 11 and the table 3 comes to rest. I

Having thus described my invention and its method of operation, what I claim is- A crosscut table-saw comprising frame, transversely arranged supporting standards having outwardly-projecting lugs at the base thereof, a shaft mounted longitudinally of the frame carrying a rotary saw transversely of the frame, a longitudinal table adapted to be moved sidewise, from front to rear or vice versa across the face of the saw parallel with the saw-shaft and having depending lugs located outside of the standards, lower and upper journal-bearings mounted on the standards, a power-shaft mounted in the lower journal-bearings with suflicient play to enable the inner end of the shaft to be slightly raised, and lowered, and having a friction-gear at its inner end, a shaft mounted in the upper journal-bearings having ends projecting beyond the standards, and a friction-pulley located over the friction-gear, disks fixed to the projecting ends of the upper shaft, and each having a crank-pin, parallel arms pivoted to the lugs of the standards, working in unison and each having a slot in its upper part, blocks mounted on the crank-pins within the slots of the arms, connecting-bars whereby the upper ends of the arms are coupled to the depending lugs on the table, a base-block, and a bellcrank lever pivoted in the base-block having its outer arm formed with a treadle and its inner arm formed with a sleeve surrounding the inner end of the lower shaft, whereby the inner end of the power-shaft is raised to bring the friction-gear into contact with the friction-pulley.

In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM ASHALL FIRSTBROOK.

Witnesses:

JOHN FIRSTBROOK, J. T. STUART. 

